Disk or plate for use in mills or machines for grinding or



Jam. 1`3 1925- 1,523,070 A R. HUSH DISK OR PLATE FOR USE IN MILLS OR MACHINES FOR GRINDING OR PULVERIZING ORES AND OTHER MATERIALS Original Filed Aug. 12, 1919 Patented dan.v 13, 1925.

,entre RALPH I-IUSH, OF JOHANNESBURCT, TRANSVAAL, SOUTH AFRICA.

DISK OR PLATE FOR `.USE IIN MILLS B 'MACHINES FOR GBINDING OB. PULVERIZING ,GRES AND .OTHER MATERIALS.

Original application leidyllugust 12, 1919,Seria1 No. 317,040. Divided and thisapplication led August 1.2, 1922. Serial No, 581,412.

To all whom t may concern.'

Be it known that I, RALPH HUsrr, a sub ject of the King of `Great Britain,andrres ident ofdohannesburg, Transvaal Province,

-Uniontof South Africa, have invented certain new andV useful'Improvementsin Disks or Plates vfor Use in Mills 'or Machines for Grinding or Pulverizling-Qres vand Other Y Materials, of whichthe Ifolloivingis aspecification. V.

This invention relates to improve-ments `in the grinding disks or plates yusedin millsor machines for Lgrinding or p ulveriz'ing ore and other material, and more` particularly `for use in those types of small millsor pulverizers in'lwhich the grinding Ais effected between fixed and rotating disks, employed in laboratories for reducing or pulverizing samples or small A.quantities of. such niaterials. Theinvention, either in whole or in part, can, however, be. adopted lforuse in mills or machines-of larger size for reducing ore or like material. Y Y l l This application is a division of application Serial number 317,040, filed August 12,

The invention will be mo-re fully explained with the aid of the accompanying drawings, in which- Fig. 1 is a front view of one form of the ixed disk.

Fig. 2 is a sectional view of Fig. 1 on line :i3-.

Fig. 3 is a front view of' one form of the rotating disk.

Fig. 4.- is a sectional view of Fig. 3 on line g/-fj.

Fig. 5 is a front view of an alternative form of the fixed disk.

Fig. 6 is a sectional view of Fig. 5 on line a-z.

Fig. 7 is a front view of an alternative form of the rotating disk.

Fig. 8 is a sectional view of Fig. 7 on line -y.

In the construction illustrated in Figs. 1 and 2, one form of the fixed disk 1 is shown, and in Figs. 3 and 4, one form of the rotating disk 2 is illustrated. This construction of the disks is best suited for pulverizing comparatively coarse material. In constructing the disks l, 2, I prefer to make them with continuous distribution of the load or stresses during the complete revolution of the disk. y

rIhe fixed disk 1-see Figs. l and 2-has eight of the corrugations 3 which extend to within a short distance ofthe central inlet 4, in the direction of whichthey taper, as usual. The rotating disk 2--see Figs. 3 and -fhas teu of the corrugations 5 of the same length or approximately the same length as the corrugations 3 of the fixed'disk 1.

In Figs. and 6 I illustrate :l ltype of fixed disk 6, and in Figs. 7 and 8, a type of rotary disk 7, which are primarily intended for the pulverizing of comparatively fine material, the corrugations 8 in.Figs. 5 and 6, and 9 in Figs. 7 and'fi, being shortcned or constructed `so .as to extend for a shorter distance from the inner edge 10 of the grinding faces 11 of the disks toward the centre; that is to say the inner portions of the corrugations are removed. This is desirable, as when reducing fine material the long corrugations are not worn down sufficiently to maintain the necessary clearance between them to allow the grinding faces of the disks to assume their correct relative positions.

As shown in Figs. 1 to 4, and 5 to 8, the rotating disks 2 and 7 have two more corrugations than the fixed disks l and 6 re spectively, viz, 10; 8. Provided, however, that each disk has an even number then the rotating disk should have two more corrugations than the` fixed disk.

It must, however, be understood that there must never be less corrugations on the fixed disk than two-thirds the number on the rotating disk; for instance two corrugations on the fixed disk and four on the rotating disk would not give the desired result, as two on the one would shear with two on the other simultaneously. The effect of my construction is that it prevents all the corrugations shearing simultaneously and gives a more uniform or symmetrical distribution of the stresses on the shaft, and also prevents the tendency to separa-te or open CSI the disks when the shearing is effected simultaneouslyby all the corrugations.

j The fixed disksA 1 and 6 may each, as shown, Vbe provided with'say two projections 12, 13, the one 12 preferably placed at one side of the central inlet 4, and the other 13 placed more or less dia-metrioally opposite the'first-mentioned one 12. These projections 12, 13, are tapped or provided with internal screw-threads which serve to accommodate the screws by which the disks 1 or 6 are attached to a stationary portion of the mill or grinding machine.

The rotating disks 9, and 7 may'each, as shown,`be provided with say three projections 14, 15, 16, Varranged symmetrically around the centre of the disk. These projections are tapped or internally screwthreaded and serve to receive the screws which attach said rotating disks to the disk orV other rotating part carried by the driving shaft of the VVmill or grinding machine.

In the caserof mills inwwhich grinding disks of large size are employed, that pornon of the disk which nes between ai@ inner ends of the corrugations can be replaced by a permanent centre piece, made of any suitable metal or material. This would obviate the waste of the material that would otherwise occur if the entire disk had to be discarded after it had been worn out. EX- pressed in other words the disk can be constructed of annular shape and be fitted with a permanent centre piece, so that the an'` nular outer part only would have to be disi Icarded when Worn out.

What I claim as myinvention and desire f to protect byiLetters Patent is V:-- Y Y l. A pair of grinding disks `for use ina grinding mill, one of which is fi'Xedand the other arranged to co-operate therewith when rotatechboth ofsaid disks being lconstruct- Y 2. A pair of grinding disks .forV useV in ay grinding mill, one of which is fixed and the l other arranged to co-operate therewith when 1 rotated, both of saiddisks being constructed with inwardly tapering, outwardly `eX- i'ng only a short distance fromfthe inner edges of the grinding faces of the disksV towards .the'centre vof the' disk, therotating disk having two more ribs'than the fixed ing an even number,-as` set forth. 1

In testimony whereof If have signed my name to this specification in theV presence Vof two subscribing witnesses.

Witnesses: f

ARTHUR THOMPSON, ARTHUR HARRY.

Vtending ribs, `saidV ribs beinginclined' from Y the periphery towardstheV centre in the di-v rection of thebacks ofthe disks and eXtend- Y 65V disk, and the number of ribson each disk bes 

